Control mechanism for compound turbines.



I I. A. DAVIES.

CONTROL MECHANISM FU R COMPOUND TU'RBINES.

1 APPLICATION F'ILED ILILY ITIIQIBH 1 Patented May 6, 1919.

a SHEETSQSHEET 1.

INVEN TOR.

WITNESSES: I u u ATTORNEY J. A. DAVIES.

" CONTROL MECHANISM FOR COMPOUNDTURBINES.

APPLICATION m w JULY 11. 1916. \y 1,32,639Q Patented Mayfi, 1919.

3 SHEETSSYHEET 2.

IYNVENTOR.

(II/III] III/I J. A. DAVIES-.- co'mno MECHANISM FOR COMPOUND wamwes.

APPLlCAT'-0N FILED JULY 1?. l91-6.

katente'fi m 6, 1919.

3 SHEETS-SHEET 3.

INVENTOR.

HIS ATTORNEY IN PAC? before high pressure NITED STATES-PATENT orrioiz.

JAMES A. Davies, or swIssvnLnrn NsYLvANIA, AssIGNOR T0 WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY. a CORPORATION OF PENNSYLVANIA.

CONTROL MECHANISM FOR OONPOUN]: TURBINES.

To all whom it may concern:

, Be it known that I, JAMES A. DAVIES, a"

subject of the. King of Great'Britain and Ireland and a resident of Swissvale, in the county ofAllegheny and State of Pennsylvania, have made a new and useful Invention in Control Mechanism for Compound Turbines, of which the following is a specification.

This invention relates to compound engines or turbines and particularly to valve mechanisms for controlling the delivery of motive fluid to'both the high and low pressure sections of the engine.

In marine turbine installations it is common practice to divide'the turbine unit 1nto two sections, one of which is termed the high pressure section and receives high pressure steam and the other of which normally receives low pressure steam discharged from the high pressure section. It is sometimes desirable to operate both sections independently and therefore to deliver high pressure steam to the sectionwhich normally receives low pressure steam. It is therefore customary to provide a separate maneuvering valve for both the high pressure and the low pressure sections of the turbine unit, and to so arrange the fluid passages that high pressure steam may be delivered simultaneously to both sections'of the turbine. deliver high pressure steam to the low pressure sectionnvhile the high pressure section is also receiving steam, it is necessary to provide means for shutting off communica-l ti on between the two sections and for establishing direct communication between the high pressure section and the exhaust passages. l

An object of my present-invention is to provide a simple valve mechanism for closing ofi communicationbetween the two sectionsand for establishing direct communication between the high pressure section and the exhaust passages.

A further object is to provide new and improved means for insuring that the high pressure section is placed 'in communication with the exhaust passages or condenser the low pressure section.

These and other objects, which willfbe made apparent throughout the further de- Specification of Letters Patent.

In order to rversing elements a whlch through piping 8, valve 9, and

steam is delivered to scription of my invention, by means of apparatus embodying features herein described and illustrated. I

'In the drawings accompanying and forming a part hereof:

Figure 1' a diagrammatic plan view of a cross compound turbine equipped with valve high pressure and low pressure sections or establish communication between the high pressure section and the exhaust.

Patented May 6, 1919. Application filed July 17, 1916. Serial No; 109,695

are accomplished Fig. 3 is a more or lessv diagrammatic view illustrating an interlocking mechanism forming a part of the present invention; and 1 Fig. 4 is an elevation of a apparatus shown in- Fig. 3. g

' Fig. 5 is a View along the line A A of Fi z1.-.' r

fieferring to the drawings: The turbine illustrated consists of a high pressure secportion of the tion 4 and a low pressure section-5. The

high pressure sect on is provided with ahead working elements 4., which receive motive fluid or steam from any suitable source of supply through a pipe or passage 6. The section 4 is-also provided with re receive steam througha pipe or passage 7. 'As shown, the ahead and astern elements 4 and 4 are separated by a partition wall 4.. The section 5, like thesection 4, is provided with ahead and reversing working elements 5 and 5 respectively, the'former of which normally receive motive fiuiddischarged from the ahead elements of the section 4, whereas the latter normally receive fluid discharged from the reversing elements of the section 4. For this reason,

the high pressure section 4 is provided with two eX- haust ports, one of which communicates piping 8 with the inlet port of the section 5 serving the ahead elements of that section. As

shown, one of these exhaust ports is on eachside of the partition wall 4. The other exhaust port of the section 4 serves the revers ing elements ofthat section and communr cates, throughpiping 10, valve 11 and pip- 30 rect communication with the exhaust and for ing 10,with the inlet port of the section serving the reversing elementsof that section.

Under normal operating conditions steam is delivered to either the ahead orastern working elements 4 or 4 of the section 4 means of a. maneuvering valve 12, which l ay be 'of ordinary construction. The

a steam, after traversing one or the other sets of working elements of the section 4, is discharged through the exhaust port, serving those elements, and is delivered to'the corresponding Working elements of the section 5. For example, while the turbine unit is running ahead, steam is delivered through the pipe-6 to the ahead elements of the ,sec-

' 'tion 4 and, after having traversed those'eletaneously cutting as communication between ments, is delivered through the pipe 8, valve 9 and pipe 8 to the ahead elements of the section 5. While the turbine unit is reversing, steam'is delivered to the reversing elements of the section 4, from which it is delivered through the pipe 10, valve 11 and' pipe 10' .to the reversing elements of the section 5. The section 5 1s shown provided with a single-exhaust port 13, which may communicate with. a condenser.

When it is desired to operate the section 5 independently of the section 4, means must be employed for placing the section 4 in d1- cutting ofl' communication between it and the working passages of the section 5. The valves 9 and 11 constitute this means, I the former controlling communication between the ahead elements of both sections and the latter controlling communication between the reversing elements of both sections. In-

asmuch as these valves may be of similar 40' tails of construction of the valve 9.

construction, I' have onlyillustrated the, de-

Referring to Fig. 2: The valve, as illustrated, includes a casing 14, and a .double throw valve disk 15. The casing'is provided with a single inlet port 16 and two delivery ports 17 and 18. The valve disk 15 is so arranged within the casing that it is capable of establishingcommunication between the ports 16 and 18' and ofsimultaneously cuttin ofi' communication between the ports 16 an 17; or of establishing communication between the ports 16 and'17 and of simulthe ports 16 and 18.

Referring again to Fig. 1, but in connection with Fig. 2; the port 16 of the valve communicates with the piping 8, whereas the port 17' communicates with the piping 8.

For the sake of clearance the port 17 has been revolved through a 90 degree angle in Fig. 2, and consequently Fig. 2 does not correspond exactly to the diagrammatic illustrationof the valve shown in Fig. 1 and Fig. 5. When the valve is in the position illustrated in Fig. 2, steamv discharged from the ahead .elementso f'the high pressure section 4 is delivered through the valve to the ahead elements of the low pressure section 5. When the valve disk 15 is moved to shut off communication between the ports 16 and 17 and to' establish communication between the ports 16 and 18, steam'is delivered from the high pressure section, through the pipe 8, the valve 9 and piping 20, to the exhaust chamber of the section 5, it being understood that this chamber communicates directly with the exhaust port 13 of the section 5 and that therefore steam discharged from these'ction 4 is bypassed around the working elements of the section 5 and is delivered directly to the exhaust of the turbine or to the condenser serving the turbine. It will also be understood that the piping 20 communicates with the port 18 of the valve casing 14.

The corresponding port of the valve 11 communicates withpiping 21, which also communicates with the discharge chamber of the section 5 and consequently with the discharge port 13.

Referring again to Fig. 2, it will be seen that 1 have provided a 'fluid actuated 'plun-' ger 22 on thevalve stem 23 of the valve disk 15 and that this plunger is normally held bya spring 24 in the position in which communication is established between the ports .16 and 17 The plunger 22 is illustratedas located within acylinder 25, which is adapted to receive actuating fluid through a port 26 and piping 27, the port 26 being so located that fluid, introduced into the cylinder through it, operates to move the plunger 22 in opposition to the pressure of the spring 24 and to establish communication between the ports 16 and 18. As illustrated. the valve stem 23 is provided with an extension 28 which projects beyond a cylinder head 29, with which the cylinder 25 is provided.

This extension is 3 ovided with an o aeratin lever 30, which may be employed to control the operation of the valve, independently of the fluid actuated plunger, and which also performs the function of a sight indicator since it indicates the position ofthe valve disk 15.

I actuating fluid to thepiping 27, and consemunication quently to the cylinders 25 of bothxof the valves 9 and 11; As shown, the valve 32 consists of a casing 33 and a valve disk 34:, which is adapted to normally clo'se communication between an inlet port 35 and a delivery port 36 with which. theeasing 33 is provided. The port 35 communicates with any sourceoffluid under pressure, such for example, as afsteam nain or a source of oil pressure and the port 36 communicates with the piping 27. The valve disk as shown is normally held to its seat by a closing spring 37 and is provided with a. valve stem 38,

which projects through the casing 33. In

order to open the valve 32 and to deliver actuating fluid to the piping 27, I, have pro-.

vided a pivoted lever 39, which is adapted to be lifted into locking engagement with a latch 40, shown in Fig. 3, in which position it engages the stem 38 and opens the valve, thereby delivering actuating fluid to the actuating plunger of both the valves '9 and 1 1 and causing those valves to cut off combetween the working. passages of the sections 4 and 5 and to establish direct communication between the section t and the In Fig. 1, l have illustrateda. maneuvering valve mechanism i2, which is adapted to control the delivery of high pressure steam to the section As shown, the maneuvering valve mechanism-42 zreceives motive fluid from the steam line 4C3, and in efiect, consists of two valves42 and 42". The valve 42 is adapted to deliver high pressure steam through a .pipe or passage 44' to the inlet port serving the ahead elements of the section 5.

The valve 42* is adapted to deliver high pressure fluid through a pipe or passage-45 to the inlet port serving'the reversing elements ofthe section 5. As illustrated, both of these valves are of the ordinary construction and eachis provided with a hand wheel for operating it. g I

Inasmuch as it is necessary to close off direct communication between the section 4c and the section 5 and to place the element 4 in communication with the exhaust before delivering high pressure" fluid to one or the other sets of working elements of the section 5, it is desirable to provide means for insuringthat the changeover valves 9 and 11 ac complish this prior to the delivery of high pressure steam to either the ahead or reverse working elements of the sect on 5. For

this reason I have provided an interlocking mechanism between the operating wheels 46 and 47 and the actuating mechanism ofthe controlling valve 32, of the valves 9 and 11.

Asshown in Figs. 3 and 4c, thehand wheels 46 and 47 of the respective valves 42 and 42* are each provided with a concentricgear or annular rack 48,- which is rigidly mounted on the wheel or on the valve stem of the corresponding valve. Theaotuatinglever 39 of lockingbar 39 which also a collar 53 formed onthe lever, trated in Fig, 4, I have the l the valve 32 is shown is adapted to be locked into engagement with the rack 48, of both the hand wheels +6 and i7 for the purpose of locking them in the valve closing position when the lever 39 is lowered out of engagement with the valve stem 38. The bar 19 performs the function of holding the lever 39 in an operative position with rela: tion to the stem 38 of the valve 32, since it s adapted to engage the latch keeper 40. a

As shown in the drawings, the bar 49 extends through a slot 50 provided in the lever 39, and is engagedby a pin 51, which is movable longitudinally of the lever for the purpose of varying the position of the bar The bar i9 is forced outwardly, against the pin 51, by a spring 52, which bears upon As illusprovided a finger lever 54 for moving the-pin 51 and consequently-the bar 49 in opposition to the pressure of the spring. The lever 54 is pivotally mounted on a lug 55 of the lever 39 and, projecting into a'recess formed within ever, engages the pin 51". \Vith this arrangement the bar 49 can be readily shifted for thepurpose of disengaging the racks 48 or the latch keeper -10.

ith apparatus constructed as in Fig. 3, the lever 39 will drop by gravity, when disengaged from the keeper 4:0 and its bar 49 will then engage the racks 48. It will be apparent that the engine man cannot open either of the valves 42 or 4-2 without first disengaging the lever 39 from the racks 48. In addition to this, the lever must be locked into engagement with the keeper 40 or it will drop down and hamper the operation of opening one or the other of the valveselQ or 42? As soon as the lever 39 is raised and latched into engagement with the keeper, the change over valves 9 and 11 innncdiately Y establish communication between the section various changes, modifications, additions,

omissions and substitutions may be made in the apparatus illustrated without departing from the spirit and scope of the invention as set forth by the appended claims.-

What I claim is:

1. In combination with a turbine divided intoa high pressure section and a low pres sure section, each provided with an ahead and a reversing element, a valve mechanism for c()ntrolling the delivery of fluid to the high pressure section, a valve receiving fluid from the ahead element of the high pressure sectionand adapted to deliver the fluid sov provided with an interreceived to the ahead element of the low pressure section or to the exhaust, a valve for receiving fluid exhausted from the rethe low pressure section, a valve mechanism 1'or deliverin high pressure fluid to the ele-. ments of the ow pressure section, and pressure controlledmeans for actuating both of said before mentioned valves to close ofl communication between said sections and for establishing communication between the high pressuresection and'the exhaust.

2. "In combination with a turbine-divided into a high pressure section'an'd a'low pres sure section,.each provided withan' ahead and a reversing element, a valve mechanism for controlling the delivery of fluid to the highpressuresection, a valve receiving fluid from the ahead element of the high pressure section and adapted to deliver the fluid so received to the ahead element of the' low pressure section or to the exhaust, a valve forreceiving fluid exhausted from thereversin element of the high pressuresection and adapted to deliver the fluid so received to the exhaust or to the reversing element of the .low pressure section, a valve mechanism for delivering high pressure fluid to the elements of the low pressure section, pressure actuated means for actuating both of said before mentioned valves to close off communication between said sections and for establishing communication between the high pressure section and the exhaust, and an interlocking mechanism for holding said last; mentioned valve mechanism closed and for,

controlling-the delivery of actuating fluid to said means. i i

3. In combinationwith a compound engine having a high pressure section and a low pressure section, a valve for establishing communication between said sections or between the high pressure section and the exhaust, controlling means therefor, a valve mechanism for delivering high pressure steam to the low pressure section,'and inter- I locking means for said last mentioned valve for controlling the operation of said first mentioned valve, said interlocking means ineluding a member which falls into locking engagement with the last mentioned valve whennot in engagement with the controlling means of the first mentioned valve. '4. In combination with a compound engine having a high pressure section and a low pressure section, a valve for establishing communication-between said sections or between the high ,pressure section and the exhaust, pressure actuated means. for control;

ling the operation of said valve, a valve for delivering high pressure motive fluid to said low/pressure section, and means interlocking w th-said last mentioned means for controlling the operation of said pressure actuated communication between said sections or between the high pressure section and the exl1aust,controlling means therefor, a valve mechanism for delivering high pressure steam to the low pressure section, means interlocklng with said valve mechanism for I actuating said first mentioned valve to establish communication between said high pressure section of the engine, and the exhaust when moved out of interlocking engagement with said valve mechanism, said interlocking means including an interlocking member which automatically moves into locking engagement withthe valve mechanism when not in engagement with the controlling meansof the first mentioned valvei 6. In combination with a compound engine having a high pressure section and a low pressure section, a valve for establishing communication between said sections or between the high pressure section and the exhaust, pressure actuated means for controlling the operation of said valve, a valve mechanism for delivering high pressure steam to the low pressure section of the (em I gine, means interlocking with said mecha nism for controlling the operation of said pressure actuated means to actuate the valve to shutoff communication between .the .sections and to establish communication behaust when moved out of, interlocking engagement with said valve mechanism.

7 In combination with a compound engine having a highpr'essure section and a low pressure section, a valve for establish- .ing communication between said sections or between the-high pressure section and the ex haust, pressure actuated means for controlling the operation of said valve, a delivery tween the high pressure section and the exfor allowing the delivery valve to close and to lock the 'lastmentioned valve in a closed position when said member is in another position.

8. In combination with a turbine having a high pressure section and a low pressure section, a valve for'delivering steam from the high pressure section to the low pressure section when in one position and to theex-i haust when inanother position, a plunger responsive to fluid pressure for controlling said valve, a-valve for delivering high pressure steam to the low pressure section, aidelivery valve adjacent thereto for controlling the delivery of actuating fluid to and from the plunger of the first mentioned valve, and an interlocking member for releasing. the high pressure valve and for opening the delivery valve in one position, and for locking the high pressure valve and for closing the delivery valve in another position, said member being arranged to automatically move from one position to the other when released. 9. In combination with a turbine divided into a high pressure section and a low pressure section, each provided withan ahead and a reversing element, a valve mechanism for controlling the delivery of fluid to the high pressure section, a valve receiving fluid from the ahead element of the high pressure section and adapted to deliver the fluid so received to the ahead ele ment of the low pressure section or to the exhaust, a valve for receiving fluid exhausted from the reversing element of the high pressure section and adapted to deliver the fluid so received to the exhaust or to the reversing element of the low pressure section, means for controlling'both of said valves, a valve mechanism for delivering high pressure fluid to the elements of the low pressure section and an actuating means for the controller adapted to be moved into and outof operative relation with the controlling means and when out of operative position to lock the last mentioned valve mechanism.

10. In combination with a turbine divided into a high pressure section and a low pressure section each provided with an ahead and a reversing element, a valve mechanism for controlling the delivering of fluid to the high pressure section, a second valve mechanism for delivering-high pressure fluid to the elements of the low pressure section, a valve receiving fluidjrom the ahead element of the high pressure section and adapted to deliver the fluid so received to the ahead element of the low pressure section or to the 'section to the exhaust, and means for controlling the last mentioned means adapted,

when out of operativerelation therewith, to

lock the second valve mechanism in closed position, and when 111 operative relation to permit the opening of the second valve mechanism.

11. In combination with a turbine divided into a high pressure section anda low pressure section, each provided with an ahead and a reversing element, a valve mechanism for controlling the delivery of fluid to the high pressure section, a mlve receiving fluid from the ahead element of the high pressure section and adapted to deliver the fluid so' received to the ahead element of the low pressure section or to the exhaust, a valve for receiving fluid exhausted from the reversing element of thehigh pressure section and adapted to deliver the fluid so received to the exhaust or to the reversing element of the low pressure section, a means for delivering high pressure fluid to the elements of the low pressure section, means for actuating the before mentioned valves, means for controlling the said actuating means, and means cooperating therewith for holding the pressure delivering means inoperative when the said valves are delivering high pressure fluid to the low pressure section.

-In testimony whereof, I have hereunto subscribed my name this 15th day of July,

J AMES DAVIES. 

